package com.dpj.edu.service.impl;

import com.alibaba.excel.EasyExcel;
import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.dpj.edu.entity.Subject;
import com.dpj.edu.entity.excel.SubjectData;
import com.dpj.edu.entity.subject.OneSubject;
import com.dpj.edu.entity.subject.TwoSubject;
import com.dpj.edu.listener.SubjectExcelListener;
import com.dpj.edu.mapper.SubjectMapper;
import com.dpj.edu.service.SubjectService;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import org.springframework.beans.BeanUtils;
import org.springframework.stereotype.Service;
import org.springframework.web.multipart.MultipartFile;

import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

/**
 * <p>
 * 课程科目 服务实现类
 * </p>
 *
 * @author testjava
 * @since 2022-01-26
 */
@Service
public class SubjectServiceImpl extends ServiceImpl<SubjectMapper, Subject> implements SubjectService {

    @Override
    public void saveSubject(MultipartFile file, SubjectService subjectService) {
        try {
            //文件输入流
            InputStream in = file.getInputStream();
            //调用方法进行读取
            EasyExcel.read(in, SubjectData.class,new SubjectExcelListener(subjectService)).sheet().doRead();
        }catch(Exception e){
            e.printStackTrace();
        }
    }
    //课程分类列表（树形）
    @Override
    public List<OneSubject> getAllOneTwoSubject() {

            //1 查询所有一级分类  parentid = 0
            QueryWrapper<Subject> wrapperOne = new QueryWrapper<>();
            wrapperOne.eq("parent_id","0");
            List<Subject> oneSubjectList = baseMapper.selectList(wrapperOne);

            //2 查询所有二级分类  parentid != 0
            QueryWrapper<Subject> wrapperTwo = new QueryWrapper<>();
            wrapperTwo.ne("parent_id","0");
            List<Subject> twoSubjectList = baseMapper.selectList(wrapperTwo);

            //创建list集合，用于存储最终封装数据
            List<OneSubject> finalSubjectList = new ArrayList<>();

            //3 封装一级分类
            //查询出来所有的一级分类list集合遍历，得到每个一级分类对象，获取每个一级分类对象值，
            //封装到要求的list集合里面 List<OneSubject> finalSubjectList
            for (int i = 0; i < oneSubjectList.size(); i++) { //遍历oneSubjectList集合
                //得到oneSubjectList每个eduSubject对象
                Subject eduSubject = oneSubjectList.get(i);
                //把eduSubject里面值获取出来，放到OneSubject对象里面
                OneSubject oneSubject = new OneSubject();
//            oneSubject.setId(eduSubject.getId());
//            oneSubject.setTitle(eduSubject.getTitle());
                //eduSubject值复制到对应oneSubject对象里面
                BeanUtils.copyProperties(eduSubject,oneSubject);
                //多个OneSubject放到finalSubjectList里面
                finalSubjectList.add(oneSubject);

                //在一级分类循环遍历查询所有的二级分类
                //创建list集合封装每个一级分类的二级分类
                List<TwoSubject> twoFinalSubjectList = new ArrayList<>();
                //遍历二级分类list集合
                for (int m = 0; m < twoSubjectList.size(); m++) {
                    //获取每个二级分类
                    Subject tSubject = twoSubjectList.get(m);
                    //判断二级分类parentid和一级分类id是否一样
                    if(tSubject.getParentId().equals(eduSubject.getId())) {
                        //把tSubject值复制到TwoSubject里面，放到twoFinalSubjectList里面
                        TwoSubject twoSubject = new TwoSubject();
                        BeanUtils.copyProperties(tSubject,twoSubject);
                        twoFinalSubjectList.add(twoSubject);
                    }
                }
                //把一级下面所有二级分类放到一级分类里面
                oneSubject.setChildren(twoFinalSubjectList);
            }
            return finalSubjectList;
        }

    }


